求救。拓扑学。会的亲帮个忙。。好难啊完全不会画图和计算。。。_数学吧

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求救。拓扑学。会的亲帮个忙。。好难啊完全不会画图和计算。。。

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The surface A⊂R3 is the union of a vertical cylinder Amid, of radius 1, height 2 and centredat the origin,and two semi-spheres A+ and A− of radius1, capping the top and bottom of Amid.Sketch and parametrise A. (It suffices to give parametrisations for Amid, A+ and A− separately.)

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